Blackscreen when loading games with multiman on CFW

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Running Wutangrza 3.55 CFW with Geohot on top and multiMan 1.17.02 Full with BDemu.pkg. Trying to load Mortal Kombat (already installed patch pkg and changed eboot and dfengine.sprx files) with disc inserted. Multiman exits to XMB with disc game changed to Mortal Kombat as it should but when try to run this it gives me a blackscreen and freezes. What's happening and how to fix?
Thanks

try moving from internal drive to external drive or vice versa. Another thing that worked for me , go into Game settings for game in multiman and select update , if there is an available update will download , install this package and try the game again , this worked when i was having problems with motorstorm.